My feedback will be bold and I’ll be breaking this into two sections to be more digestible.
Your Chameleon - Veiled Chameleon, Male, and about 7-8 months old.
While it’s not always easy to tell, going from his casque size, I’m thinking he’s much younger…like about 4 months old. Either that, or his growth may be a bit stunted. Where did you get him from? Most chain pet stores have incorrect husbandry. 
I’ve had him for around a week and a half.
Handling - Since I just got him, he doesn’t let me handle him at all. Anytime I get close he starts to hiss and do t-rex hands. I haven’t held him at all.
This is pretty normal for veileds, plus he needs time to settle in and feel safe. While he may never become ‘friendly’, you do want to work on building trust with him. This is a wonderful blog on doing that. https://www.chameleonforums.com/blogs/building-trust-with-your-chameleon.2396/ Chameleons are similar to fish, in that they are more for looking at.
Feeding - Mealworms and baby crickets? Every night and morning I give him about 4-5 mealworms with subelements and have fed him 10 baby crickets twice so far. I don’t have a feeder.
I’m attaching some graphics for you. You want to feed him just once in the morning so he has time to bask and digest. It’s very hard for me to tell you how many feeders to give him without knowing his age. He does look like a smaller than adult size and will need some good nutrition to recover from that burn, so I’ll say to give him about 8 or so appropriately sized feeders daily. To determine what size feeders, look at the space between his eyes. That is the maximum size he is able to eat. I’m thinking the equivalent of 1/2” crickets would be a good size for him. Mealworms are not good staple feeders. There are much better options. What I often advise is to get a variety pack from one of the on line insect vendors. Here’s a few options. https://www.rainbowmealworms.net/chameleon-sampler-pack/
https://joshsfrogs.com/kp/josh-s-frogs-chameleon-feeder-bundle-kit58304
Of course I’m getting called away. Sorry…will return to as soon as able.
Supplements - I sprinkle Reptile Calcium brand Zoo Med, without D3 on his worms every other time he eats.
Watering - I have a dripper dripping constantly. I mist every maybe 2 hours for a couple minutes. I only seen him licking a leaf a couple times.
Fecal Description - Vertical, white, sometimes had a golden brown substance with it. He has never been tested for parasites.
History - I’ve only had him for a short while.